Tube-coating brush



March 17, 1931. C, F, MOORE 1,796,337

TUBE COATING BRUSH Filed June ll, 1926 2 Sheets-Sheet l Ma/Ma @am March-l7, 193i. c. F. MOORE TUBE comme BRUSH Filed June l1, 1926 2 Sheets-Sheet 2 Patented Mar. 17, 1931 UNITED STATES 4PATENT OFFICE CHARLES F. MOORE, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO DAMPNEY COMPANY OF AMERICA, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS TUBE-COATING :BRUSH Application filed .Tune 11,

My invention relates generally to means for applying a protective coating to the inside of boiler tubes and the like, and more particularly to brushes adapted for use in conjunction with apparatus such as that disclosed in the co-pending application of Moore & Stubbs, SerialNo. 43,962, filedy July 16, 1925,which matured into Patent No. 1,671,374 on May 29, 1928.-

The object of the present invention is to provide rotary brushes for applying a uniform coat of suitable material to the inside walls of boiler tubes and the like.

In the accompanying drawings,

Fig. 1 is a planview of one form of my rotary brush; y Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1 looking in the direction indicated by the arrows;

Fig. 3 is an end view taken on the left side of the brush illustrated in Figs. 1 and 2;

Fig. 4 is a sectional view taken on the line 4 4.- of Fig. 2;l a

Fig. 5 is a view of another brush embody- 25 ing features o fmy invention; j

f Fig. '6 is a sectionalview taken on the line 9-9 of Fig. 5;

Fig. 7 is a sectional view taken on the line 10-10 ofy Fig. 5. f y

Referring now to the drawings in detail, in which like reference Anumerals designate similar parts throughout the several views, denotes a shaft (Fig. 1) which is pivotally secured to a pairof arms 21 and 22. The shaft 35 20 may be driven by any suitable source of power, as for example, a turbine motor (not shown). The arm 21 has a pair of lateral ears 23 and 24A (Fig. 4) and the arm 22 has a pair of lateral ears 25 and 26. The ears 23 4o and 24 fit over the shaft 20, which, as shown in Fig, 4, may be made square in cross section. The vears 25 and 26 it Vover the ears 23 and 24 of the arm 21 as is clearly shown in Fig..4. A pivot bolt 27 passes through the s ears as well as the shaft 2O and is fastened Vtheretoby means of a nut 28.

The arms 21 and 22 are bent toward each other at 30 (Fig. 2) and then extend in parallel relationship to each other in an out- 50 ward direction where they are. formed into 1926'. Serial No. 115,158.

channel portions 3l and 32, respectively. Mounted in each channel portion is a base 33 of a brush 34 (Fig. 3). V

The base 33 of the brush 34 preferably has an arcuate-shaped face 35 to which the bristles 36 of the brush may be fastened or secured in any usual or desired manner.

Extending from the end of the arm 22 1s a lateral lprojection 37 having an opening 38. Extending from the end of the arm 21 1s a lateral projection 39 which passes through the opening 38 in the projection 37. The end of the projection 39 is bent into a hook 40 disposed at right angles to the main portion of the projection 39, which serves to catch the edge of the projection 37 deiining the opening38 therein to limit the distance to which the arms 21 and 22 may be separated, as will become more obvious hereinafter.

As best shown in Fig. 3, the sides or legs 41 of the channel portion `31 are bent over portions of the arcuate top'of the base 35 of the brush associated therewith so as to retain the brush 34 on the arm 21. Similarly, the sides or legs 42 of the channel portion 32 are bent over portions of the brush 34 mounted thereon. Thus it will be evident that in order to mount a brush on either the arms 21 or 22, it will be necessary to insert it endwise in the channel portion associated with either of these arms. The ends of the brushes adjacent the pivotal mounting will abut the bent arms 21 and 22 where they merge into the corresponding channel portion, as indicated at 30. That is to say, the arms themselves will limit the movement of the brushes in one direction.

Now, in order to retain the brushes in the jso-called channel portions 31 and 32, I prefyerably form integral with each of the portions a pair of lateral ears 43 which pair of ears may be connected by a pin 44 (Fig. 3). This pin 44 may have its ends 45 bent over so as to retain it in place. Each of the pins 44 extend over the bottom of the chan* nel portion associated therewith and serve to limit the movement of the brush therein to prevent it from becoming dislocated or from getting out of the channel portion. Ob-

viously, in order to remove a brush from its corresponding channel portion, it will be necessary to remove the pin 44 before the brush can be moved endwise. The pins 44 are highly simple and effective means for retaining the brushes in place on the arms 9.2 and 21.

The operation of this brush is believed to be apparent from the foregoing detailed description of the same. Upon power being applied to the shaft 20 to revolve the same, the brushes will, due to centrifugal force, ily outwardly into engagement with the wall of the tube being coated by this brush. The outward movement of the brushes 34 will be limited by the portion 40 coming into engagement with the wall defining the opening 38 in the projection 37 of the arm 21. In Fig. 2 I have shown in dotted lines the position that these brushes will assume upon iiying outwardly as far as the structure of the support for the brush will permit.

The manner in which the brushes are maintained in position is comparatively simple and, at the same time, enables the brushes to be removed with facility whenever it is desired to replace or clean them.

In Figs. 5, G and 7 I have illustrated a modification by my novel improved coating brush. In this construction, reference numerals and 81 designate a pair of circular discs or plates spaced a given distance apart and positioned in axial alignment. The plate 80 has integral therewith a polygonal shaped coupling member 82 provided with a threaded aperture 83 by means of which the entire brush construction may be coupled to a suitable air motor. Formed integral with the plate or disc 81 is a circular boss 84 disposed in axial alignment therewith. This boss has a threaded aperture 85 into which one end of a stop piece or projection 86 may be threaded.

Connecting the two plates 81 and 8O is a shaft 88, 'whose ends are loosely mounted in l the plates so as to enable the plates to be readily detached therefrom. The shaft 88 has two dat sides 89 and 90, as thus shown in Fig. 6. The plates are also connected by a pair of diametrically opposed rods 91. Each end of these rods is attached to a plate by a screw 92 threaded through the plate and int-o the end of the rods. The ends of these rods cooperate with the screws to maintain the plates rigidly in place at a given distance apart. It will be seen that the plates may be readily detached therefrom by simply removing the screws 92. Also connecting the plates are a pair of pivot pins 95, the outer ends of which are threaded and carry nuts 95. Positioned intermediate the plates are a pair of brushes and a suitable mounting and support for each. Since both of the brushes 100 are identical in construction, it is believed a description of one will suffice for both.

Each brush 100 includes a base 101 having an arcuate shaped top 102 from which project bristles 103. The base 101 of each brush is disposed in a channel portion 105 which is adapted to normally abut the Hat portion of the central shaft. The channel portion 105 includes a pair of lateral sides 106 and 107 for receiving the said base of the brush. The side 107 is equipped with a pair of apertured lugs 108 as best shown in Fig. 5. The apertures in these lugs are adapted to receive pins 109 which serve to retain the brush in place in the channel portion 105 as best illustrated in Fig. 7.

Each channel portion 105 is also equipped with a pair of lateral ears 110 through which the pivot pin 95 associated therewith extends. That is to say, these ears 110 are pivotally mounted upon the pivot pin 95. As best shown in Figs- 6 and 7, each lateral ear 110 is cut away to forin an arcuate shaped aperture 113 which is adapted to receive the rod 91 when the brushes fly outwardly, due to centrifugal force.

The operation of this form of brush is believed to be obvious from the foregoing detailed description. It is apparent that upon the turning of the entire brush construction the brushes will immediately move outwardly due to centrifugal force. Their outward movement will be limited by the lateral ears 110 engaging the rods 91. As pointed out above, the lateral ears 110 are pivotally mounted upon the pivot pin 95. Also, from the foregoing description, it is obvious that the brush construction may be very easily disassembled for 'repairs or replacement of parts. The brushes may be removed with facility from their corresponding channel portions 105 by removing the pins 109 from the apertured lugs 108. Then, too, normally when the brushes are not in their outermost positions, they are adapted to abut the central shaft 88. Furthermore,the central shaft 88 is cut away as shown in Fig. 6 at the place indicated by the reference numeral 114 to accommodate the lateral ears when the brushes are resting on the central shaft 88.

Now I desire it understood that although I have disclosed and described two forms of my novel coating brush, the invention is not to be limited thereby or to detailed description thereof, but only in so far as defined by the scope and spirit of the claims hereto appended. l

1. In a brush construction, a rotable support adapted for connection to means for rotating the same, a pair of channel members pivoted to said support and disposed back to baclr, each of said members having ears projecting from one edge through which they are pivoted, and brush means Yremovably held in the channels of said members, the channel members moving outwardly about their pivots and by centrifugal force upon rotation of said support.

2. In a brush construction, a rotatable support adapted for connection to means for rotating the same, a pair of channel members pivoted to said support and disposed back to back, each of said members having ears projecting from one edge through which they are pivoted7 brush means held in the channels of said members, and means for limiting the outward movement of said members, the channel members moving outwardly about their pivots and by centri ugal force upon rotation of said support. Y 3. In a brush construction, a pair of aX- ially aligned plates, rods connecting said plates, a plurality of brushes, pivot pins for the brushes connected tothe said plates, each brush being pivotally connected along one longitudinal edge thereof to a pivot pin, said brushes being adapted to fly outwardly when the brush construction is revolved, and means on each brush adapted to cooperate with one of said rods to limit the movement of the brush.

In witness whereof, I hereunto subscribe my name this 27th day of May, 1926.

CHARLES F. MOORE. 

